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Twenty\u2010seven microorganisms were identified in the placental tissue using nested polymerase chain reaction (<jats:styled-content style=\"fixed-case\">PCR<\/jats:styled-content>). <jats:italic>Porphyromonas gingivalis<\/jats:italic> (<jats:italic>P.\u00a0gingivalis<\/jats:italic>) was quantified by droplet digital <jats:styled-content style=\"fixed-case\">PCR<\/jats:styled-content>.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The prevalence of microorganisms was 9.47% (20\/211). <jats:italic>P.\u00a0gingivalis<\/jats:italic> was the most prevalent (12\/211, 5.68%). <jats:italic>Mycoplasma hominis<\/jats:italic>,<jats:italic> Ureaplasma urealyticum<\/jats:italic>,<jats:italic> Staphylococcus<\/jats:italic> spp, and <jats:italic>Fusobacterium nucleatum<\/jats:italic> were isolated at a very low frequency in the placenta. <jats:italic>Candida albicans<\/jats:italic> was associated with <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content> (<jats:italic>P\u00a0<\/jats:italic>=<jats:italic>\u00a0<\/jats:italic>0.027). Periodontitis was associated with clinical signs of infection (odds ratio [<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>]\u00a0=\u00a03.8, 95% confidence interval [<jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>]: 1.28\u201013.5) and with <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content> (<jats:styled-content style=\"fixed-case\">OR<\/jats:styled-content>\u00a0=\u00a01.99; 95% <jats:styled-content style=\"fixed-case\">CI<\/jats:styled-content>: 1.07\u20103.72).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The presence of <jats:italic>P.\u00a0gingivalis<\/jats:italic> in the placenta was not associated with perinatal complications. Detecting microorganisms in the placenta by nested <jats:styled-content style=\"fixed-case\">PCR<\/jats:styled-content> is not relevant, as it has a poor association with clinical variables that establish the diagnosis of chorioamnionitis. However, periodontitis was associated with the clinical signs of intra\u2010amniotic infection and <jats:styled-content style=\"fixed-case\">PTD<\/jats:styled-content>.<\/jats:p><\/jats:sec>","DOI":"10.1111\/jicd.12396","type":"journal-article","created":{"date-parts":[[2019,1,21]],"date-time":"2019-01-21T01:23:38Z","timestamp":1548033818000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":17,"title":["Oral and uro\u2010vaginal intra\u2010amniotic infection in women with preterm delivery: A case\u2010control study"],"prefix":"10.1111","volume":"10","author":[{"given":"Daniel A.","family":"Montenegro","sequence":"first","affiliation":[{"name":"Obstetrics and Gynecology Service Hospital Sim\u00f3n Bolivar  Bogot\u00e1 Colombia"},{"name":"School of Medicine Universidad El Bosque  Bogot\u00e1 Colombia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Luis 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